Recursive: Example 1

Recursive

Find the recursive formula for the sequence: 4, 12, 20, 28, 36...

Step 1. Define the first term.

Step 2. Find the pattern to get from one term to the next.

4 + 8 = 12
12 + 8 = 20
20 + 8 = 28
28 + 8 = 36

Step 3. Write a recursive function to represent this pattern.

Step 4. Put the two parts together into one recursive formula.

The recursive formula is: